These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/htslib-1.23.1:0/3::gentoo  USE="bzip2 lzma -curl" 4871 KiB
[ebuild  N     ] sci-biology/samtools-1.23.1::gentoo  9247 KiB

Total: 2 packages (2 new), Size of downloads: 14117 KiB